西南石油大学学报(自然科学版) ›› 2010, Vol. 32 ›› Issue (2): 69-72.DOI: 10.3863/j.issn.1674-5086.2010.02.013

• 地质勘探 • 上一篇    下一篇

核磁共振研究低渗透储层孔隙结构方法

王学武 杨正明 李海波 郭和坤   

  1. 中国科学院渗流流体力学研究所,河北 廊坊 065007
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2010-04-20 发布日期:2010-04-20

EXPERIMENTAL STUDY ON PORE STRUCTURE OF LOW PERMEABILITY CORE WITH NMR SPECTRA

WANG Xue-wu YANG Zheng-ming LI Hai-bo GUO He-kun   

  1. Institute of Porous Flow and Fluid Mechanics,Chinese Academy of Science,Langfang Hebei 065007,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2010-04-20 Published:2010-04-20

摘要:

核磁共振T2分布和压汞毛管压力分析数据均在一定程度上反映了岩石的孔隙结构,理论分析表明,这两组数据具有相关性。通过对大庆外围油田10块低渗透岩样核磁共振T2分布和压汞毛管压力曲线的分析研究,提出同时考虑非线性和压汞进汞饱和度不足100%进行拟合的方法,将T2分布转化为孔隙分布,并且得到转化系数的经验公式。分析了两种方法的差异性,研究结果表明,此方法能明显提高毛管压力曲线的构造精度,并且经该方法转化后的岩芯中值半径和分选系数与压汞结果非常接近,证明了该方法的可靠性。为核磁共振T2分布研究孔隙结构提供了可靠的理论和方法支持。

关键词: 核磁共振, 毛管压力曲线, 进汞饱和度, 孔隙结构, 低渗透储层

Abstract:

Both NMR T2 distribution of core and capillary pressure can be used to characterize pore throat structures of rock to a certain extent.Theoretical analysis reveals a correlation between these two sets of data.NMR T2 distribution and capillary pressure of 10 low permeability cores from peripheral low permeability oilfield of Daqing are analyzed.Considering both nonlinear and mercury intrusion saturation is less than 100% to match,a new method that is used for constructing pore structure from NMR T2 distribution is put forward,and experiential expression is derived. The difference between two methods is analyzed.The result shows an improved precision and indicates that this method can provide reliable principle and methodology support for applying T2 distribution for the pore structure evaluation.

Key words: nuclear magnetic resonance, capillary pressure, mercury intrusion saturation, pore structure, low permeability reservoir

中图分类号: